Sonet system and method which performs TSI functions on the backplane and uses PCM buses partitioned into 4-bit wide parallel buses
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United States of America Patent
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Jun 17, 2003
Grant Date -
N/A
app pub date -
Mar 31, 1999
filing date -
Apr 29, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A SONET network interface for interconnecting a high speed unit (HSU) with low speed interface units (LSUs) is provided for enabling transmission of signals therebetween. The interface includes: a bus for interfacing the HSU with each of the LSUs to enable transmission of signals from each of the LSUs to the HSU, and reception of the signals from the HSU to each of the LSUs, wherein the HSU, LSUs, and the bus are contained in a primary shelf. The network interface also has secondary shelves, each containing secondary LSUs and an intershelf ring interconnection (IRI) bus connecting the primary shelf and each of the secondary shelves in series for exchanging data between the HSU of the primary shelf and each of the secondary shelves. Wherein the IRI bus has full access to the bandwidth of each of the at least one secondary shelves and each series connection between shelves comprises a drop bus for transmitting data to the next shelf in the series and an add bus for receiving data from the next shelf in the series and accumulating the received data from each of the at least one secondary shelves for transmission through the series and to the primary shelf.
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